Surgery – Instruments – Orthopedic instrumentation
Patent
1991-08-01
1992-06-16
Hafer, Robert A.
Surgery
Instruments
Orthopedic instrumentation
411386, 606 76, A61B 1756, F16B 2500
Patent
active
051221322
ABSTRACT:
A skull pin provides greater resistance to shear forces so that it may be more readily made of titanium, ceramic or gem stone, yet still prevents undue penetration, and can be tightened if wear or erosion of the skull results from cyclic loading. The pin is used with a halo or cervical traction ring, and has a main, externally threaded, circular cylindrical body, and a skull engaging portion. The skull engaging portions is formed by first and second concentric, in-line cylinders terminating in conical sections, the first conical section terminating in the second cylinder (which resists shear forces much better than conventional skull pins), and the second conical section terminating in a pointed tip. The first cylinder has a diameter of about 0.18 inches, the first conical section has a length of about 0.09 inches and approximately a 60.degree. taper angle, the second cylinder has a length of about 0.03 inches and a diameter of about 0.07 inches, and the second conical section has approximately a 60.degree. taper angle.
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S. Garfin et al, "Structural Behavior of the Halo Orthosis Pin-Bone Interface: Biomechanical Evaluation of Standard and Newly Designed Stainless Steel Halo Fixation Pins", SPINE, vol. 11, No. 10, 1986, pp. 977-981.
Bremer Medical Brochures "Halo Accessories", Adjustable Ring Traction Sets, and Halo Crown.RTM.; 1987, 1990.
Bremer Medical Inc.
Brown Michael
Hafer Robert A.
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